Mark Oberkirsch Copper Designs Buffalo Jar In Shadowbox Frame Vintage Signed Art. Native American. Beautiful art piece in shadowbox frame. This has art of a buffalo jar with a little tiny buffalo on the tassel. It says mark 93 at the bottom and is in great condition. Copper and metal pieces used in S art. Vintage 93. It’s a little over 10 in.². Matted with a blue and burgundy color matting please look at the pictures for what you will receive.